// 时间格式化
// 使用：var d = new Date().format('yyyy-MM-dd');
Date.prototype.format = function(format) {
   var date = {
		  "M+": this.getMonth() + 1,
		  "d+": this.getDate(),
		  "h+": this.getHours(),
		  "m+": this.getMinutes(),
		  "s+": this.getSeconds(),
		  "q+": Math.floor((this.getMonth() + 3) / 3),
		  "S+": this.getMilliseconds()
   };
   if (/(y+)/i.test(format)) {
		  format = format.replace(RegExp.$1, (this.getFullYear() + '').substr(4 - RegExp.$1.length));
   }
   for (var k in date) {
		  if (new RegExp("(" + k + ")").test(format)) {
				 format = format.replace(RegExp.$1, RegExp.$1.length == 1
						? date[k] : ("00" + date[k]).substr(("" + date[k]).length));
		  }
   }
   return format;
}